Portable powee drill



y 1941 H. P. CHANDLER 2,283,722

PORTABLE POWER DRI LL Filed Dec. 3, 1940 2 Sheets-Sheet l 3nnentor HOMERP. UHJINDLEB @Wfi k Gttorneg 19, 1942. H. P. CHANDLER PORTABLE POWERDRILL F119;; Dec. 5. 1 2 Sheets-Sheet 2 3nnentor H 01mm 1 CHANDLERattorney Patented May 19, 1942 E' PORTABLE POWER DRILL Homer P.Chandler, Mansfiel'd,,0hio, assignor to The Ohio Brass Company,Mansfield, Ohio, a corporation of New Jersey Application December 3,1940, Serial No. 368,355

11 Claims.

This invention relates to portable power drills and particularly todrills for boring recesses in the heads of railway rails for receivingterminal studs of rail bonds.

One object of the present invention is to provide a power drill formaintenance work which shall be lightweight, easy to handle, and capableof being easily and quickly adjusted in position for operation and yetone which shall have sufiicient power to operate the drill under heavyfeeding pressure.

A further object is to provide a portable power drill with quickly andeasily operable gaging meansfor determining the depth and spacing of thedrilled holes.

The further object of the invention is to pro-' vide a power drill whichmay beoperated by a gasoline motor of standard construction.

A further object of the invention is to provide a device in the classnamed which shall be of improved construction and operation.

Other objects and advantages will appear from the following description.

The invention is exemplified by the combination and arrangement of partsshown in the accompanying drawings and described in the followingspecification and it is more particularly pointed out in the appendedclaims.

In the drawings:

Fig. 1 is a side elevation with parts in section showing the drill inoperative relation with a railway rail.

Fig. 2 is a top plan view of the mechanism shown in Fig. 1.

Fig. 3 is a vertical section on the line 33 of Fig. 1.

Fig. 4 is a transverse .section on the line 4-4 of Fig. 3, but with theparts in a different relative position from that shown in Fig. 3.

Fig. 5 is a section on the line 5-5 of Fig. 1.

In the drawings, the numeral I designates a small gasoline engine ofstandard construction preferably having reduction gearing disposed in agear housing II and having a drive shaft 12 projecting at one side ofthe engine. A bracket comprising a plate I3 is secured to the side ofthe engine adjacent the projecting end of the shaft I2 by means of bolts14 attached to the gear housing H. The plate I3 is provided with anopening l through which the bearing boss l5 for the shaft l2 extends. Apair of spaced arms I! and 18 project from the plate I3 at oppositesides of the shaft 12 and the outer ends of these arms carry hooks l9and 20 for engaging the head 2| of a railway rail to be recessed.Adjustment screw 22 and 23 are threaded in the arms I! and 18respectively and bear on the upper face of the rail head to locate thearms vertically relative to the head. Adjustment screws 24 and 25 arecarried by the outer ends of the hooks l9 and 20 respectively forengaging the outer face of the rail head to locate the hookshorizontally relative to the rail for a purpose to be more fullyexplained later. The screws 24 and 25 are provided with hand wheels 26rigid with the screws and locking wheels 21 threaded on the screws. Abracket 28 is provided with spaced arms, one of which is shown at 29 inFig. 1 of the drawings, the arms being attached to the base of theengine ID by screws 30. The bracket is provided with a handle portion 3|and an upwardly extending arm 32 connected to a second handle 33. Theforward end of the handle 33 is connected by a strap 34 and branches 35to bolts 14 which attach the bracket and plate l3 to the front of g theengine frame. The bracket 28 has aligning sleeve portions 36 and 3lwhich receive a shaft or bar 38 having a foot rest 39 connected to itslower end by a ball and socket 40. The shaft 38 may be threaded into thesleeve 36 and provided with a hand wheel 4| for adjusting the shaftlongitudinally. Other means for securing the shaft in longitudinallyadjusting positions may be employed instead of the threaded connectionif desired. A guide bar 42 is secured to the foot rest 39 and hassliding engagement with an opening in the sleeve 36 to prevent rotationof the foot rest.

A drill chuck 43 is splined on the forward end of the drive shaft l2 andcarries a drill 44 for penetrating the rail 2|. The drill chuck anddrill are moved forwardly into engagement with the rail by an operatinglever 45 pivotally mounted on a shaft 46 carried by ears 4'! projectingfrom the plate l3. A spring 48 tends to move the lever 45 forwardly soas to retract the chuck 43. The lower end of the handle 45, as shown inFig. 5, is provided with bifurcations 49 which engage trunnions 50 on asplit collar 5| which carries a thrust ball bearing 52 having an innersleeve 53 secured to reduced portion 54 of the chuck 43 by means of aring nut 55. An abutment bar 56 extends through a transverse slot in thechuck 43, the ends of the bar projecting into a recess 51 in a ring nut58 threaded on the outer periphery of the chuck. The abutment bar 56 maybe accurately located by the ring nut 58 and locked in position by thelocking rin 59,

also, threaded on the chuck. The drill may be secured in the chuck by aset screw threaded into either one of the openings 60. The chuck 43extends through an opening 6| in a transverse bar 62 secured to thebracket arms I1 and I8. A depth gauge 63 is pivotally mounted on acotter 64 carried by a lug projecting inwardly from the bracket arm l8.

In operation the drill is disposed at the outside of the rail as shownin the drawings and adjusted to bring the point of the drill at theproper height relative to the rail head by th screw 22 and 23. The handwheel 4| is then rotated until the axis of the shaft l2 and drill 44 isbrought into a horizontal position. Any suitable level gauge may beemployed for accurately determining the horizontal adjustment. With thedrill projected forwardly as far as it will go, while the gauge 63 isinterposed between the collar 5| and bar 62, the entire drill mechanismis moved forwardly or to the left, as viewed in Fig. 1, until the pointof the drill 44 engages the face of the rail. The adjustment screws 26and 25 are then threaded inwardly until they engage the opposite face ofthe rail from that engaged by the drill. The depth gauge 63 is thenlifted out of engagement with the cross bar 62 and the handle 45 ispulled rearwardly by the operator while the engine is running to pressthe drill into contact with the face of the rail and cause it topenetrate the rail. The lever is operated until the split collar 5|contacts the cross bar 62. The drill will then have enetrated the railto a depth equal to the thickness of the depth gauge 63. The depth ofpenetration is accurately determined by the thickness of the depthgauge.

The proper position of the recess relative to the end of the rail isdetermined by means of a sight gauge 65 mounted on the arm ll. When theinner end of the gauge 65 is in alignment with the end of the rail to bebored the hole will be properly spaced from the end of the rail. Afterthe hole in the rail has been bored, the handle 45 is released and thespring 48 withdraws the drill from the recess.

A pin 65 is slidably mounted in perforations in a pair of ears 6! on thearm 18 and is held in either of two extreme positions by a compressionspring 68. The pin is shown in its retracted position in Fig. 2 of thedrawings. After the first hole has been drilled, the pin is movedforwardly until the spring 68 passes its center position. The springwill then cause the pin to bear against the face of the rail. The entiredevice is now moved along the rail until the pin 66 registers with theopening just drilled. When this occurs, the spring 68 will snap the pin66 into the opening and arrest the movement of the drill mechanism. Thepin will now accurately locate the drill it in the proper position fordrilling the recess in the adjacent rail. After the pin 66 has thussnapped into place the drilling operation is repeated and the ends ofboth rails will then be properly drilled for receiving the ends of arail bond.

The drill may be carried from place to place by the handle 33 or it maybe trundled along the rail by the handle 3|. For this purpose a roller69 is provided, which is journaled between arms :0, at the lower end ofa bar H, as shown more clearly in Fig. 3. The bar H extends through asleeve '12 carried by a cross bar 13 mounted on the arms I? and [8. Theroller 69 is held in a retracted position by a spring pressed pin M, asshown in Fig. l, and in a projecting position as shown in Fig. 4. Theroller may be moved from one position to the other by a handle 15 on theupper end of the bar ll. When it is desired to move the drillingmechanism, the pin 14 is retracted and the drill lifted until the bar Hslides downwardly into a position where the pin M snaps into the upperopening in the bar H thus locking the roller in its projected position.The entire device may then be lifted from the rail and turned through anangle of degrees from the position shown in Figs. 1 and 2. The roller 69may then be rested on the rail and by grasping the handle 3|, theoperator may readily trundle the device to a new point of operation.

The entire device with a three quarter horsepower engine weighs onlyabout eighty-five pounds and an engine of this size has suflicient powerthat the strongest operator cannot overload it. It can drill a rail inseven seconds or less and the handy flexible adjustments make it quicklyadapted to any size or conditon of rail. The holes are accurately spacedand automatically regulated as to depth, regardless of variations in therail and changes in operating conditions. The device can be easilyoperated by one man either for new construction or for maintenance work,but it is designed particularly for maintenance operation.

I claim:

1. In a portable track drill a power motor having a drive shaft, spacedbracket arms rigidly secured in fixed position to said motor, one ateach side of said drive shaft for engaging a railway rail, means forconnecting a drill to said drive shaft in axial alignment with saiddrive shaft and for projecting said drill against a rail en aged by saidbracket arms, and an adjustable support secured to said motor at theside thereof opposite said bracket arms to aid said bracket arms insupporting said motor with the axis of said drive shaft in a horizontalposition while said drill is projected to penetrate said rail.

2. In a portable track drill, a power motor having brackets rigidlyfixed directly to opposite sides thereof for suspending said motortherebetween, a drive shaft projecting from said motor at the sideadjacent one of said brackets, means on said drive shaft for holding adrill in posi tion to penetrate a rail engaged by the adjacent bracket.means adjustably carried by the other bracket for resting on the railsupport at one side of the rail and a carrying handle disposed abovesaid motor and connected with said brackets.

3. In combination a motor having a projecting drive shaft, a drill chucksplined on said drive shaft, a lever arm for moving said chuck alongsaid shaft to project a drill in said chuck in the direction of the axisof said shaft, bracket arms rigidly fixed to said motor, one at eachside of said drive shaft and shaped to engage a railway rail and anadjustable support for said motor at the side thereof opposite saiddrive shaft.

4. In combination a power motor having a main power driven rotor, adrive shaft projecting from said motor in the direction of the axis ofsaid rotor, a bracket secured to the side of said motor adjacent saiddrive shaft and having rail engaging means thereon for holding saidmotor to a rail with the axis of said rotor transverse to said rail,means for connecting a drill to said drive shaft, means for projectingsaid drill against a rail engaged by said rail engaging means to drill arecess therein, an adjustable support for said motor at the side thereofopposite said bracket and a handle connected with said motor fortransporting the same, said support operably associated with saidhandle.

5. In combination, a motor having a projecting drive shaft, a drillchuck on said drive shaft, track rail engaging means secured to one endof said motor for holding said motor in position for a drill in saidchuck to penetrate a rail engaged by said means, a lever arm pivotallysecured to said means for projecting said chuck to force a drill thereinagainst a rail engaged by said means and a stop pivotally secured tosaid means for limiting the axial movement of said chuck to determinethe depth of hole made by said drill.

6. In combination a motor having a projecting drive shaft, a drill chucklongitudinally slidable on said shaft, a movable stop for limiting theforward movement of a drill in said chuck, adjustable track railengaging means secured to said motor for adjusting the position of saidmotor so that a drill in said chuck just touches the surface of a railengaged by said track rail engaging means when said drill is in theposition determined by said movable stop, and a second stop for limitingforward movement of said drill at a predetermined distance beyond theposition determined by said first mentioned stop to limit the depth ofthe hole drilled in said rail by said drill.

'7. In combination a motor having a projecting drive shaft, a drillchuck splined on said drive shaft, a lever for sliding said chuck alongsaid shaft, a stop for determining the extreme forward position of adrill in said chuck, a movable stop for arresting forward movement ofsaid drill at a point spaced back of its extreme position a distanceequal to the predetermined depth of a hole to be drilled, and adjustabletrack rail engaging means for fixing said motor in a position in whichsaid drill just touches the face of a rail engaged by said track railengaging means when the forward position of said drill is determined bysaid movable stop so that projection of said drill from said position toits extreme position will produce a hole in said rail of saidpredetermined depth. I

8. In combination a motor having a projecting drive shaft, a drill chucksplined on said shaft, a bracket secured to said motor and having railengaging arms at each side of said shaft, cooperating stops on saidchuck and bracket for limiting forward movement of a drill in saidchuck, a gauge of a thickness equal to the depth of a hole to be drilledin a rail, said gauge being arranged to be interposed between saidstops, and adjustable means on said rail engaging arms for fixing theposition of the motor relative to a rail engaged by said arms so that adrill in said chuck will just touch the face of said rail when theforward position of said chuck is determined by said gauge and so thatwhen said gauge is removed and said chuck is moved forwardly untilarrested by said cooperating stops a hole will be drilled in said railof a depth equal to the thickness of said gauge.

9. The combination with a drill and operating mechanism therefor ofmeans for engaging a rail to hold said drill in position while drillinga recess in said rail, a longitudinally movable pin mounted on said railengaging means in parallel spaced relation with said drill and springmeans for projecting said pin into a recess made by said drill when saiddrill is moved away from said recess a sufiicient distance to bring saidpin into registration with said recess, to locate said drill fordrilling a second recess at a predetermined distance from said firstrecess.

10. The combination with a drill and operating mechanism therefor ofmeans for holding said drill in operative relation with a railway railand means for regulating the spacing of dilferent holes made by saiddrill said regulating means comprising a longitudinally movable pinarranged in parallel spaced relation with said drill and a spring formoving said pin in either direction from a central position and forholding said pin in retracted position when moved in one direction fromits central position and in spring pressed relation against said railwhen moved in the other direction so that when a hole has been drilledin said rail and said drill moved along said rail to bring said pin inregistration with said hole said pin will snap into said hole and fixsaid drill in definite spaced relation with said hole.

ii. The combination with a motor having a projecting drive shaft, of adrill chuck mounted on said drive shaft, bracket arms attached to saidmotor adjacent said drive shaft and having track rail engaging meansthereon, a bracket secured to said motor at the side thereof oppositesaid drive shaft, a support adjustably mounted on said bracket forcooperating with said bracket arms to support said motor, a trunnionroller carried by said bracket arms and having its axis transverse tosaid drive shaft, a handle bar disposed above said motor and connectedat its opposite ends with said bracket and bracket arms respectively, ahandle on said handle bar above said motor for carrying said motor and asecond handle on said handle bar adjacent the bracket end thereof fortrundling said motor with said roller engaging a track rail.

HOMER P. CHANDLER.

